Full height Vertical filler panels that mount to outside edge of the 19" rail and extend to the plane of the side panel. The vertical filler panels for the DCF Optimized rack utilize 2 half height panels per side. Each kit is enough for 1 cabinet. 42U panel has 1 1U cut out per panel with brush strip that can be used for cable pass through. 48U panel has 2 1U cut outs with brush strip in the top and 1 1U cut out with brush in the bottom.